The next-generation woom OFF AIR 4 is an ultralight, durable hardtail mountain bike with serious all-terrain capabilities for kids aged six and up. With high-quality front suspension and powerful disc brakes, it teams maximum comfort with full control for the ultimate performance on XC trails, gravel tracks, tarmacked lanes and beyond.
Specifications
Frame
- Frame material: lightweight, high-quality 6061 T6 aluminum with butted and hydroformed tubes
- 20″ wheels
- Confidence-inspiring handling: an easy-access low top tube, low centre of gravity and long wheelbase provide good balance and make for a fun, safe ride
- Hard-wearing plastic chainstay protector prevents scratches
Gears
- 9-speed gearing
- SRAM X5 trigger shifter
- SRAM X5 rear derailleur
Fork
- Aluminum air-sprung suspension fork from RST
- Rebound and compression damping adjustment, plus lockout function
- 60 mm travel
- 1 1/8″ – 1″ baby taper steerer tube
- 100 x 15 mm thru-axle
- Post mount for disc brake
Wheels
- Lightweight, tubeless-ready aluminum rims from Alexrims
- Size: 20″
- Aluminum hubs with sealed industrial bearings
- Thru-axles for maximum torsional strength (100 x 15 mm front / 135 x 12 mm rear)
- 20 spokes, double-crossed spoking
- Aluminum nipples
Headset
- Fully integrated 1 1/8″ – 1″ headset
- Sealed industrial-grade bearings
Tires
- 20 x 2.25" Schwalbe Rocket Ron
- with ADDIX SPEED rubber compound and Tubeless Easy technology
- Tubeless-ready
- Presta valves
Stem
- Forged aluminum
- CNC-machined
- Handlebars attached via two clamps
- +/-15° flip-flop design to adjust handlebar height
- Length: 50 mm
Saddle
- MTB-specific saddle
- Trail-ready design
- Ergonomic and age-appropriate design to fit the rider's pelvis
- Side protection to lean against walls
Handlebars
- Wide, lightweight aluminum bars with tapered ends
- Width: 570 mm
- Rise: 20 mm
Seatpost
- 27.2 x 250 mm
- Anodised aluminum seatpost with insertion marks that indicate the minimum insertion depth
Grips
- Child-friendly thanks to small diameter
- Ultra comfortable with reinforced contact surface for palms
- 100% silicone for maximum grip
- Clamped design to eliminate twisting
Seatpost clamp
- Quick-release aluminum seatpost clamp
- Extra-long quick-release lever, easy to operate requiring minimal strength
- No risk of turning and/or twisting
Drivetrain
- Lightweight forged aluminum cranks
- 110 mm length, narrow Q-factor
- Narrow-wide chainring with 28 teeth
- Cassette with 11–32 teeth
- Platform pedals made from fiber-reinforced nylon with metal pins for added grip
- Cr-Mo axle and sealed industrial-grade ball bearings
Brakes
- Hydraulic disc brakes by Promax
- Disc diameter (front/back): 160/140 mm
- Ergonomic brake levers designed for children's hands
Included tools
- 4 mm hex key for stem
- 8 mm hex key for front wheel and pedals
